[talk-au] Mapping in Sydney..

[80n]

On 8/20/07, Ian Sergeant <isergean at hih.com.au> wrote:
>
> "Franc Carter" <franc.carter at gmail.com> wrote on 20/08/2007 12:11:41 PM:
>
> > I think the pub problem is an instance of the more general problem
> > of overcrowding
> > on a map when we ge lots of detail (which is a good thing). The
> > solution that I have
> > heard that I like most is to have map layers that contain deifferent
> > classes of information
> > so you can do things like turn on/off the maps. Having said that I
> > know little about
> > map generation.
>
> Yes, the OSM way seems to be add the data, and leave the rest to an
> advances in rendering technology at some later stage.
>
> However, I can see the purpose in putting the pub location in a country
> town where you may actually want to find a pub.  I can see the point in
> listing cafe's in the suburbs, as I need a coffee now and then when I am
> cycling around.  I can see the purpose of using it in the UK, where people
> often navigate by pubs.
>
> However, in the Sydney CBD, where there are several pubs, bars, cafes or
> restaurants on every block, I just don't think we are helping anyone find
> a
> drink by listing every single one of them in the OSM, and the current
> rendering obscures other features - and currently there are only a
> fraction
> of the pubs currently entered into OSM - so it is going to get much worse
> before it gets better.
>
> I just don't think it would be possible to ever produce a map with any
> rendering technology at any level of zoom that could successfully map them
> all in a readable way, even if we were producing a pub & bar guide.


The current generation of renderers tend to render everything just because
the data is sparse enough to get away with it.

They will probably become more selective in the future.  There will probably
be separate layers for different kinds of features.  Another suggestion for
pubs is to only render those that also have some kind of tag like
navigation_landmark=yes.

There's also a common technique by which only things that are sparse get
rendered.  So densely packed pubs would not get rendered, except at possibly
the very very highest zoom levels.  On the other hand a solitary pub
half-way to Perth might get rendered even at a very low zoom level.

80n





Ian.
>
>
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